EP1319832B1 - Electromagnetically operated pump - Google Patents

Electromagnetically operated pump Download PDF

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Publication number
EP1319832B1
EP1319832B1 EP02102744A EP02102744A EP1319832B1 EP 1319832 B1 EP1319832 B1 EP 1319832B1 EP 02102744 A EP02102744 A EP 02102744A EP 02102744 A EP02102744 A EP 02102744A EP 1319832 B1 EP1319832 B1 EP 1319832B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
pump
piston element
coil
keeper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02102744A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1319832A2 (en
EP1319832A3 (en
Inventor
Pierluigi Dell'orto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dell Orto SpA
Original Assignee
Dell Orto SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dell Orto SpA filed Critical Dell Orto SpA
Publication of EP1319832A2 publication Critical patent/EP1319832A2/en
Publication of EP1319832A3 publication Critical patent/EP1319832A3/en
Application granted granted Critical
Publication of EP1319832B1 publication Critical patent/EP1319832B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor

Definitions

  • the present invention concerns an electromagnetically operated pump to feed two-stroke internal-combustion engines with precise and controlled amounts of oil.
  • the present invention concerns a pump of this type, the structure of which - while preserving the characteristics of a simple construction, a metering precision and an easy setting, which are indispensable for the specific use for which the pump is designed - allows to considerably reduce its overall dimensions and guarantees an improved reliability thereof.
  • the pump according to the invention - of the type as described in the introductory part of Claim 1 is characterized from the features pointed out in the characterizing part of Claim 1.
  • said piston element is of nonmagnetic material and said annular coil is housed into a cavity of the cylinder formed on the front of said keeper in said second base of the cylinder.
  • a disk is interposed between said second base of the cylinder and said keeper, said disk having a central hole through which said piston element freely passes.
  • the spring means act between said disk and said keeper, opposing the movements of the piston element controlled by said coil, said spring means being positioned close to the hole of said disk, or close to its periphery.
  • the spring means are housed peripherally into the pumping chamber, so as to act directly on the piston element, in correspondence of its first end.
  • Said spring means preferably consist of a cylindrical helicoidal spring, coaxial to the cylinder of said pump.
  • the piston element is suitably formed - in the different variants of the aforedescribed embodiment - with a portion of reduced diameter towards its second end, the extension of said portion contributing to determine the capacity of the pump.
  • the piston element has instead a constant diameter and the capacity of the pump depends on the distance between the keeper and the cylinder, when the keeper is subject merely to the action of the spring means which oppose the movements of the piston element controlled by said coil.
  • spring means can consist of a Belleville washer, coaxial to the cylinder of the pump and interposed between said second base of the cylinder and said keeper, or of a cylindrical helicoidal spring housed peripherally into the pumping chamber.
  • Fig. 1 is an axial section view of a first embodiment of the pump according to the present invention
  • Fig. 2 shows a detail of the pump of fig. 1 , along the line II-II thereof;
  • Fig. 3 illustrates a first variant of the embodiment of the pump shown in fig. 1 ;
  • Fig. 4 illustrates a second variant of the embodiment of the pump shown in fig. 1 ;
  • Fig. 5 shows a second embodiment of the pump according to the present invention, illustrating a first variant thereof
  • Fig. 6 illustrates a second variant of the embodiment of the pump shown in fig. 5 ;
  • Fig. 7 shows a detail of the pump of fig. 6 , along the line VII-VII thereof.
  • the pump according to the present invention is of the type comprising - as clearly illustrated - a casing 1 housing a cylinder 2 and a piston element 3, axially movable in the cylinder 2 and crossed by a through pipe 4 connected to pipe unions 5 and 6 in the casing 1, for the inlet and respectively the outlet of oil.
  • a pumping chamber 8 Close to a first base 7 of the cylinder 2, in contact with the casing 1 and along the corresponding pipe union 6, there is a pumping chamber 8 to pump the oil to be fed, said chamber also housing valve means of the pump, as described hereinafter.
  • a cavity 10 is formed close to the second base 9 of the cylinder 2, into said cavity there being housed a compact electromagnetic annular coil 11 which surrounds the piston element 3 and which is fed with pulse current in strict correlation with the running of the two-stroke engine to be equipped with the pump.
  • the depth of the cavity 10 slightly exceeds the height of the coil 11, so that this latter can be fully housed therein and be efficiently protected.
  • the piston element 3 is connected, at its end 12 in correspondence of the base 9 of the cylinder 2, to a keeper 13 parallel and close to said base 9.
  • the electromagnetic coil 11 acts frontwards onto said keeper 13 - which is of ferromagnetic material - against the action of spring means.
  • the keeper 13 draws in its movements the piston element 3, preferably made of nonmagnetic material. Thanks to the efficiency of the frontward action - with a low magnetic gap and a magnetic circuit with low reluctance - of the electromagnetic coil 11 on the keeper 13, the movements of the piston element 3 of the pump according to the invention can be controlled by means of a coil 11 of very small dimensions and having a very compact structure.
  • the efficiency of said action is in fact far higher than that which could be obtained up to date in the pumps having coils usually extending along the whole cylinder of the pump, externally thereof, and acting directly onto a piston of ferromagnetic material in an axial sense, in magnetic circuits with a very high reluctance.
  • the arrangement of the present invention thus allows to considerably reduce the overall dimensions of the pump, providing an advantage which is particularly important for the applications pointed out in the introductory part of the present description, such as feeding oil in two-stroke internal combustion engines.
  • a disk 14 is interposed between the second base 9 of the cylinder 2 and the keeper 13, said disk 14 preferably being of nonmagnetic material and having a central hole through which freely passes the end 12 of said piston element 3 having a portion 12A of reduced diameter ( fig. 2 ); the portion of wider diameter of said piston element 3 stops instead against said disk 14.
  • Spring means act between said disk 14 and said keeper 13 opposing the movements of the piston element 3 controlled by the coil 11.
  • said spring means are centrally positioned - in 15 - close to the hole of the disk 14; whereas, in the variant of fig.
  • said spring means consist of a cylindrical helicoidal spring 17, coaxial to the cylinder 2 and housed peripherally into the pumping chamber 8.
  • the spring 17 acts directly onto the piston element 3, in correspondence of its first end, opposite to that fixed to the keeper 13.
  • the piston element 3 has a constant diameter, it being obtained from a ground bar (thereby reducing the costs in respect of the previous embodiment).
  • the coil 11 controls, when energized, the movements of the piston element 3 towards the chamber 8, while attracting the keeper 13 against the action of the spring means 15, 16 or 17.
  • Such means produce movements in the opposite sense when the coil 11 is deenergized.
  • Two ball valves 19 and 20 are provided, in known manner, in the pipe union 6 in the casing 1, in correspondence of the oil pumping chamber 8, the valve 19 cooperating with the end of the piston element 3 in correspondence of the base 7 of the cylinder 2.
  • the valve 19 is closed while the valve 20 opens.
  • the valve 20 closes while the valve 19 opens again.
  • Fig. 2 shows a detail of fig. 1 , illustrating how the capacity of the oil being pumped, for each stroke of the pump according to the invention, may be determined by varying the distance a-b in fig. 1 , namely the ratio between the length of the portion of wider diameter and the length of the portion 12A of reduced diameter of the piston element 3. This obviously also applies to the other variants of the pump adopting a similar piston element 3 ( figs. 3 and 4 ).
  • the capacity of the oil being pumped for each stroke of the pump is instead determined, as clearly shown in fig. 7 , by the distance a-b between the keeper 13 and the base 9 of the cylinder 2, when said keeper is subject merely to the action of the spring means 18 or 17 and the coil 11 is deenergized.
  • the aforedescribed pump has a very simple structure and a highly reliable working but, above all - as already mentioned - it allows to drastically limit the dimensions of the electric circuit and of the coil controlling the movements of the piston element; this considerably affects the overall dimensions of the pump, so as to be able to assert that it leads to a miniaturization thereof.
  • the pump according to the invention can moreover be easily adapted, with reduced costs, to the most different requirements of capacity, by simply varying the axial position of the abutment of the piston element 3, formed in two portions of different diameter.
  • the pump is instead less versatile, but it involves lower production costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Surgical Instruments (AREA)
  • External Artificial Organs (AREA)
EP02102744A 2001-12-13 2002-12-12 Electromagnetically operated pump Expired - Lifetime EP1319832B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001MI002647A ITMI20012647A1 (it) 2001-12-13 2001-12-13 Pompa comandata da elettromagnete
ITMI20012647 2001-12-13

Publications (3)

Publication Number Publication Date
EP1319832A2 EP1319832A2 (en) 2003-06-18
EP1319832A3 EP1319832A3 (en) 2004-01-21
EP1319832B1 true EP1319832B1 (en) 2008-04-09

Family

ID=11448694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02102744A Expired - Lifetime EP1319832B1 (en) 2001-12-13 2002-12-12 Electromagnetically operated pump

Country Status (4)

Country Link
EP (1) EP1319832B1 (it)
AT (1) ATE391837T1 (it)
DE (1) DE60225996D1 (it)
IT (1) ITMI20012647A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602004008596T2 (de) * 2004-06-11 2007-12-27 Olab S.R.L., Torbole Casaglia Schwingankerpumpe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1102555A (en) * 1964-03-14 1968-02-07 Eberspaecher Walter Electromagnetically-actuated reciprocating piston pumps for liquids
US3479959A (en) * 1967-10-23 1969-11-25 William N Christensen Electromagnetic metering pump
FR2606073A1 (fr) * 1986-10-14 1988-05-06 Orbital Eng Pty Systeme de graissage perfectionne et pompe pour des moteurs a combustion interne
FR2641338A1 (fr) * 1988-12-30 1990-07-06 Peugeot Motocycles Pompe a faible debit notamment pour le graissage d'un moteur a deux temps
IT1299987B1 (it) * 1998-04-27 2000-04-04 Magneti Marelli Spa Pompa volumetrica.

Also Published As

Publication number Publication date
EP1319832A2 (en) 2003-06-18
DE60225996D1 (de) 2008-05-21
EP1319832A3 (en) 2004-01-21
ATE391837T1 (de) 2008-04-15
ITMI20012647A1 (it) 2003-06-13

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